DRY and Pythonic jQuery?

Apparently, groovy:spring:java as jabs:jquery:javascript. As if jQuery wasn't short enough already.This 2009 post captures the era's fascination with domain-specific languages and syntactic sugar—an impulse that would later manifest in CoffeeScript, TypeScript, and modern JavaScript transpilation tools.

Jabs lets you write this jQuery code:

jQuery(function() {
    var $ = jQuery;
    
    $("[default_value]").blur(function() {
        var self = $(this);
        if(self.val() === "") {
            self.val(self.attr("default_value"));
        }
    }).focus(function() {
        var self = $(this);
        if(self.val() === self.attr("default_value")) {
            self.val("");
        }
    }).blur();
});

By typing this:

$ [default_value]:
  blur:
    if @value === ""
      @value = @default_value
  focus:
    if @value === @default_value
      @value = ""
  .blur

HAML tactics FTW.HAML's influence on web development was significant—its indentation-based syntax and DRY principles influenced template engines across many languages, from Slim in Ruby to Pug in JavaScript.